Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so…
Apache-2.0Auto-check passed
Install Environment Memory
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memory --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .claude/skills/environment-memory && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .claude/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memoryType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memory --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .agents/skills/environment-memory && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .agents/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memory --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .cursor/skills/environment-memory && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .cursor/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/ccplugins/awesome-claude-code-plugins.git --path plugins/craftsman/skills/environment-memory--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memory --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .gemini/skills/environment-memory && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .gemini/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memoryInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .github/skills/environment-memory && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .github/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ccplugins/awesome-claude-code-plugins environment-memory --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/craftsman/skills/environment-memory .opencode/skills/environment-memory && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "environment-memory" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/craftsman/skills/environment-memory into .opencode/skills/environment-memory/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "environment-memory", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
environment-memory- GitHub stars
- 967
- Token cost
- ~823 tokens
- SKILL.md length
- 435 words
- Files
- 1
- Skills in repo
- 68
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so…
- Works in 2 steps: Check… → If a matching entry exists, apply its…
- SKILL.md covers Overview, The file, Before retrying a failed… and After discovering a new quirk, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Environment Memory is an agent skill from ccplugins/awesome-claude-code-plugins. Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so failed approaches are never silently repeated.
Its SKILL.md is about 820 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Bash. The repository describes itself as: Awesome Claude Code plugins — a curated list of slash commands, subagents, MCP servers, and hooks for Claude Code. The licence is Apache-2.0.
Example prompts
- “/environment-memory”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Check ~/.claude/craftsman-memory/environment-quirks.md for a matching symptom before trying
- If a matching entry exists, apply its fix directly — don't re-verify from scratch unless the
What it can do on your machine
Read from SKILL.md and the folder at commit 5bd4f16. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Environment Memory loads about 823 tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 435 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from ccplugins/awesome-claude-code-plugins at commit 5bd4f16, republished under its Apache-2.0 licence (© ccplugins). 435 words, ~823 tokens.
Download SKILL.mdSave it as
.claude/skills/environment-memory/SKILL.md (or your agent's skills folder).- name
- environment-memory
- description
- Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so failed approaches are never silently repeated.
Environment Memory
Overview
Trial-and-error against the same broken assumption — "maybe bash works this time" — wastes turns and tokens without new information. Any OS, shell, or tool quirk discovered once should be usable forever after, in every project, not just the one where it was found.
Core principle: a quirk discovered once should never be rediscovered by trial and error.
The file
~/.claude/craftsman-memory/environment-quirks.md — deliberately outside this plugin's own
install directory, so a plugin update never wipes it. Deliberately outside any single project's
memory folder too, since quirks like "hooks run via CMD.exe not bash on this machine" apply
everywhere, not just to the project where they were found.
Format: flat, append-only, one line per entry —
<symptom> → <fix> (discovered: <date>, context: <where>)No YAML frontmatter, no index, no categorization — this file is meant to be read in full whenever it's relevant, so keep it short and skimmable rather than structured for querying (token-cheap by design).
Before retrying a failed command or approach
- Check
~/.claude/craftsman-memory/environment-quirks.mdfor a matching symptom before trying the same thing a second way, or a different way that might hit the same underlying constraint (e.g. "PowerShell syntax works where bash syntax silently no-ops" applies to any bash-syntax attempt, not just the exact command that first failed). - If a matching entry exists, apply its fix directly — don't re-verify from scratch unless the context has genuinely changed (different machine, different Claude Code version).
Show full SKILL.md (207 more words)Show less
After discovering a new quirk
- Confirm it's actually environment/tool-specific (OS, shell, PATH, tool version) and not a
one-off bug in the current task — this file is for durable facts about the machine/toolchain,
not task-specific notes (those belong in
KNOWN_ISSUES.mdfor the project instead). - Append one line in the format above. Don't ask before appending to this file specifically — unlike creating a new project file, this is pure append-only record-keeping with no file-creation side effect the first time it's used organically; do ask before creating the file itself if it doesn't exist yet, since that's a new file outside the current project.
Notion / Obsidian
- Obsidian: the whole
~/.claude/craftsman-memory/folder is a valid Obsidian vault as-is (plain markdown, no export step). Users can Open folder as vault on it to get search, backlinks, and graph view over the quirks log while Claude Code keeps writing the same files. Nothing here needs to change to support that — just keep the plain-markdown format intact. - Notion: only mirror an entry to Notion when the user explicitly asks, or when closing out an entry they flagged as important. Never mirror automatically — this file is checked frequently and a network round-trip on every check would defeat the point of keeping it cheap.
© ccplugins, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in plugins/craftsman/skills/environment-memory of ccplugins/awesome-claude-code-plugins.
Open the folder on GitHubat commit 5bd4f16
Compare with similar skills
Environment Memory next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Environment Memory this skillccplugins/awesome-claude-code-plugins | 967 | — | ~823 | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 37k | 11 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Plugin Settings Patternanthropics/claude-plugins-official | 37k | 7 repos | ~3k | Automated safety check: Pass | Apache-2.0 | |
| Mole Bug Patternstw93/Mole | 69k | — | ~2k | Automated safety check: Pass | GPL-3.0 | |
| Neat-Freak Knowledge CloseoutKKKKhazix/khazix-skills | 21k | — | ~1.9k | Automated safety check: Pass | MIT | |
| CCPM Project Managementautomazeio/ccpm | 8.4k | — | ~1.1k | Automated safety check: Pass | MIT |
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Mole Bug Patterns
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Works with
Questions about Environment Memory
What does Environment Memory do?
Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so…. Environment Memory is an agent skill from ccplugins/awesome-claude-code-plugins. Use before retrying any command, tool, or approach that failed once, and immediately after discovering any OS/shell/tool-specific quirk — checks and updates a stable cross-project quirks file so failed approaches are never silently repeated.
How do I install Environment Memory in Claude Code?
Run `npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a claude-code`. Or copy the skill folder (plugins/craftsman/skills/environment-memory in ccplugins/awesome-claude-code-plugins) into .claude/skills/environment-memory in your project. Claude Code loads it when a task matches its description.
How do I install Environment Memory in Codex?
Run `npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a codex`. Or copy the skill folder (plugins/craftsman/skills/environment-memory in ccplugins/awesome-claude-code-plugins) into .agents/skills/environment-memory in your project. Codex loads it when a task matches its description.
Can I use Environment Memory in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add ccplugins/awesome-claude-code-plugins --skill environment-memory -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/environment-memory, .gemini/skills/environment-memory, .github/skills/environment-memory and .opencode/skills/environment-memory in your project.
What does Environment Memory need to run?
SKILL.md names no scripts, command-line tools or credentials: Environment Memory is instructions for the agent only.
Does Environment Memory access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Environment Memory safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Environment Memory use?
Environment Memory is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Environment Memory use?
About 823 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Environment Memory?
Skills that share tags, products or a category with Environment Memory: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 37k stars), Plugin Settings Pattern (anthropics/claude-plugins-official, 37k stars), Mole Bug Patterns (tw93/Mole, 69k stars) and Neat-Freak Knowledge Closeout (KKKKhazix/khazix-skills, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Environment Memory?
ccplugins (a GitHub organization) maintains it in ccplugins/awesome-claude-code-plugins, which has 967 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on August 12, 2026.
Source: ccplugins/awesome-claude-code-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.